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Evaluation of Growth Rate of Invasive Aquatic Macrophytes and Contribution to Its Use in Organic Fertilizer Production: A Case of Eicchornia crassipes (Mart.) Solms, 1883 in the Lobé Creek (Littoral-Cameroon)

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Open Journal of Ecology 2024年第7期14卷 571-583页

作者： Roland Didier Nwamo Gordon Nwutih Ajonina Tapite Chanel Yamkou Kopmou Thomas Efole Ewoukem minette tomedi eyango Department of Aquatic Ecosystems Management Institute of Fisheries and Aquatic Sciences at Yabassi University of Douala Douala Cameroon Cameroon Wildlife Conservation Society Mangrove & Coastal Wetlands Research Centre Mouanko Cameroon Department of Forestry Faculty of Agronomy and Agricultural Sciences University of Dschang Dschang Cameroon Department of Aquaculture Institute of Fisheries and Aquatic Sciences at Yabassi University of Douala Douala Cameroon

From 20 January to 20 July 2023, a study was carried out on the Lobé Creek, a waterway subject to considerable natural and man-made pressures, with a negative impact on its biodiversity and habitats. The aim was to evaluate the growth rate of invasive aquatic macrophytes and their contribution to the use of organic fertilisers: a case of Eicchornia crassipes (Mart.) Solms, 1883 in the Lobé Creek (Littoral-Cameroon) with a view to its appropriate use in agronomy. The specific objective was to examine the impact of anthropogenic actions on Lobé Creek, characterise physico-chemical environment of the study area, and evaluate the growth rate of E. crassipes and its chemical composition with a view to producing an organic biofertiliser. The results show that E. crassipes represents a considerable threat to the populations of these localities. As for the physico-chemical parameters, the temperature values vary from 24 ± 1.41˚C to 26.5 ± 1.13˚C;pH from 6.3 ± 0.1 to 7.2 ± 0.07;conductivity and dissolved oxygen vary respectively from 40.7 ± 1.83 µS/cm to 19.6 ± 3.11 µS/cm and from 7.3 ± 0.14 mg/l to 5.8 ± 1.55 mg/l. Its average growth rate varies from 0.69 feet/day to 0.63 feet/day. With regard to the nitrogen, phosphorus and potassium content of water hyacinth plants, the results show that the average total nitrogen content ranges from 6.11 ± 1.59 g/kg to 5.2 ± 2.03 g/kg;total phosphorus, from 0.52 ± 0.54 g/kg to 0.88 ± 0.38 g/kg;and potassium, from 1.43 ± 0.45 g/kg to 2.61 ± 0.89 g/kg.

关键词： Eichhornia crassipes Lobé Creek Anthropogenic Actions Physico-Chemical Environment Growth Rate Chemical Composition

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Physico-Chemical and Structural Assessment of Akono Riparian Forest Watershed, Tributary of the Nyong Basin (Centre-Cameroon) at Different Stages of Degradation

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Journal of Environmental Protection 2024年第5期15卷 552-571页

作者： Nwamo Roland Didier Gordon Nwutih Ajonina Ndzougou Nkodo Colette Rose tomedi eyango minette Department of Management of Aquatic Ecosystems Institute of Fisheries and Aquatic Sciences at Yabassi University of Douala Yabassi Cameroon Cameroon Wildlife Conservation Society Mangrove & Coastal Wetlands Research Centre Mouanko Cameroon Department of Aquaculture Institute of Fisheries and Aquatic Sciences at Yabassi University of Douala Yabassi Cameroon

Freshwater bodies are natural resources that should be exploited to the fullest, while maintaining the sustainability of ecosystems and ecosystem services which they support. Riparian forests are more important as they contain rivers which are vital sources of fresh water for local populations. However, the quality and quantity of water issued from the watershed depend on the structural state of these forests. The aim of this work was to assess the physico-chemical and structural state of the Akono gallery forest. To achieve this, fieldwork consisted of selecting six major streams of the watershed including Ndjolong, Menyeng adzap, Emomodo, Mvila, Negbe and Ossoé kobok. On each of these, two stations, one intact and one degraded, were marked by transects. The method involved measuring Hydrometric parameters (depth, length, width) of the stream and Physico-chemical parameters of water in the streams while dendrometric parameters were measured along 100 m-transects laid using the point-centred quarter method modified for water bodies to collect tree, shrub and palm variables such as trunk diameter, crown diameter and height. Macrophytes and species identification were carried out using standard botanical procedures. Results showed that, the majority of physico-chemical parameters measured differed significantly between intact and degraded stations (P Pentachletra mancrophylla, whereas on degraded sites, this index was low and characterized by the relative dominance of species Piptadeniastrum africanum. Sorensen’s index (0.56) and CFA showed that the different stands were homogeneous. We can affirm that the riparian forests of Akono watershed are towards a state of stability notwithstanding the perpetuation of anthropological actions.

关键词： Akono Gallery Forest Physico-Chemical Parameters Floristic Diversity Dendrometric Parameters

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Embryonic and Larval Development of Reciprocal Crosses between Clarias gariepinus (Burchell, 1822) and Clarias jaensis (Boulenger, 1909) in West Cameroon

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Agricultural Sciences 2024年第8期15卷 848-863页

作者： Justin Ntsoli Félix Meutchieye Algrient Nana Towa Donatien Bishakabalya Lwendje minette eyango Tabi tomedi Biotechnology and Bioinformatics Research Unit Department of Animal Science University of Dschang FASA Dschang Cameroon Department of Forestry Faculty of Agronomy and Agricultural Sciences University of Dschang Dschang Cameroon Institute of Fisheries and Aquatic Sciences of the University of Douala Douala Bassa

Establishing intraspecific breeding and hybridization programs and determining genetic variability are two important issues for aquaculture. However, interspecific hybridization to improve growth and feeding efficiency is limited. For this purpose, the embryonic and larval development of reciprocal crosses of Clarias gariepinus (Burchell, 1822) and Clarias jaensis (Boulenger, 1909) were studied under laboratory conditions. The fertilization rate varied from 63.33% to 92%, while the hatching rate ranged from 55.68% to 76% with the highest value in hybrids ♀Cg × ♂Cj. Crosses between ♀Cj × ♂Cj, ♀Cg × ♂Cj and ♀Cj × ♂Cg had embryonic stages similar to those of the pure sib ♀Cg x ♂Cg. All crosses, however, had different timing for the various embryological stages. Hatching occurred at 32 h 15 min and 38 h for ♀Cj × ♂Cj and ♀Cj × ♂Cg, and 23 h and 23 h 30 min, respectively, for ♀Cg × ♂Cg and ♀Cg × ♂Cj. However, both crosses produced viable larvae until the first external feeding. The external morphological features of the larvae were completely formed by the 10th day after hatching. The body forms of the crosses at this time were indistinguishable from the pure sib. This study thus laid the groundwork for further comparative studies on hybrid performance and characterization.

关键词： Embryonic Development Larval Development Interspecific Hybridization Clarias gariepinus Clarias jaensis

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Farming Features of African Bonytongue Fish Heterotis niloticus in Cameroon, Central Africa

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Open Journal of Animal Sciences 2023年第2期13卷 232-248页

作者： Jeanne Wikondi Ema Patrick Jolly Ngono Algrient Towa Nana Felix Meutchieye minette eyango Tabi tomedi Department of Genetics and Biostatistics School of Veterinary Medicine and Sciences The University of Ngaoundere Ngaoundere Cameroon Applied Hydrobiology and Ichthyology Research Unit The University of Dschang Dschang Cameroon Department of Animal Science Biotechnology and Bioinformatics Research Unit The University of Dschang Dschang Cameroon Institute of Fisheries and Aquatic Sciences of the University of Douala Douala-Bassa Cameroon

The characterization of African bonytongue Heterotis niloticus fish farming was conducted in the Bi-modal agro-ecological zone of Cameroon from January to May 2021, Thirty-two fish farmers were interviewed and SPSS 6.2 Version was used to analyse the data. The results showed that the majority of fish farmers (81%) are men above 51 years, all of whom are Christians with more than fifty percent of them married. About 43% of them have university level education, and more than 6% of them considered the farming of Heterotis niloticus as their main income-earning activity. The main objective of Heterotis niloticus farming is sales (50%) and the uses (56%) of waged labour. A majority of the farmers produced reared African bonytongue in a polyculture system and 65% of them raised Heterotis niloticus in derivation ponds.

关键词： Aquaculture Characterization African Bonytongue Cameroon Central Africa

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Effect of Zingiber officinaleand Allium sativumPowders as Natural Feed Additives Promoting Growth, Feed Utilization and Whole-Body Composition in Clarias gariepinusFry

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Food and Nutrition Sciences 2021年第6期12卷 526-543页

作者： Paulin Nyadjeu Doriane Divine Mane Yemdjie Noël Arlette Tamko Ndjuissi Ghislain Nguimdop Nguenang Nesrine Yolande Chamsy Dedou minette eyango Tabi-tomedi Department of Aquaculture Institute of Fisheries and Aquatic Sciences of Yabassi University of Douala Douala Cameroon

Nutrition is the main factor determining the potential of farmed fish to exhibit their growth capacity as a function of the protein content and certain additives contained in their diet. Thus, the present study was conducted to assess dietary supplementation effects of ginger and garlic as feed additives on growth, feed utilization and whole-body composition in Clarias gariepinus fry. Following a 24 h fasting, 525 fry weighing 1.2 ± 0.01 g were randomly divided in triplicate into five treatments of 105 fish each and fed for 56 days. In treatment T0, fry was fed with control basal diet, in treatments T1 and T2, fry was fed with basal diet containing 1% and 2% ginger, while in treatments T3 and T4, fry was fed on basal diet supplemented with 1% and 2% garlic. Fish were fed at the rate of 10% of their body weight and every 14 days, intermediate fish sampling was done during which fry per treatment was counted, measurements taken on a representati

关键词： Clarias gariepinus Ginger Garlic Growth

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Spatial and Temporal Variation of the Hydrological Parameters in the Wouri-Nkam Section of the Cameroon Estuary, Central African Atlantic Coast

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Open Journal of Marine Science 2021年第4期11卷 129-156页

作者： Felix Besack Ebonji Seth Rodrigue Ajonina Gordon Nwutih Edikin Roland Dieudonné Sone Essoh Willy Nguekeu Brice Mbang Essome Junior Hamadou Toume Michel-Remi Onguene Raphael tomedi eyango minette Department of Oceanography of the Institute of Fisheries and Aquatic Sciences University of Douala Douala Cameroon Laboratory of Ecosystems and Aquatic Resources Douala Cameroon Institute of Fisheries and Aquatic Sciences of the University of Douala Douala Cameroon Association for the Conservation of Nature (ASCON) Douala Cameroon Douala Institute of Technology (IUT) Douala Cameroon

This study aimed to provide relevant knowledge about the dynamics of the hydrological parameters in the river-estuary continuum of the Wouri-Nkam river estuary for a sustainable management program. The hydrological parameters were recorded in eleven stations spanned out on the basis of population density and human activities. Water quality parameters (Temperature, salinity, dissolved oxygen, pH, Total dissolved solutes, Redox potential and conductivity) were collected in subsurface water using a multiple parameter. Surface currents and morphometric (depth and width) parameters were recorded using a drifter, sonar depth and GPS. The field measurements took placed between 18/05/2019 to 08/09/2020 and were divided into six (06) cruises. The data were later subjected to an analysis of variance (ANOVA) and Principle Component Analysis using XLSTAT 2017 (2.7 version) software. Results obtained revealed that, the water quality parameters were spatially more stable notsignficant at (df = 9, p 0.05) with a relatively low temperature (25.5°C - 27°C) during the wet period. The limit of the frontal zone extended to S5 (Bonalokan, 8.25 km from S1) during the snapshot of the dry period, spring ph

关键词： Hydrological Parameters Water Quality Lunar/Diurnal Tidal Regime Principle Component Analysis (PCA) and Wouri-Nkam River

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新营销近视症

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北大商业评论 2010年第3期 22-25页

作者： N.Craig Smith minette E.Drumwright Mary C.Gentile 肖迎霞 INSEAD商学院德克萨斯大学奥斯汀分校巴布森学院

50年前,泰德·他维特曾告诫营销者要纠正他们的'营销过视',让他们不再按产品,而是按客户需求来确定业务,这成为过去半个世纪以来最有影响力的营销理念.如今,对于大多数企业,这已不成为问题--顾客的需求早已超越产品,成为营销者不懈的追...

50年前,泰德·他维特曾告诫营销者要纠正他们的'营销过视',让他们不再按产品,而是按客户需求来确定业务,这成为过去半个世纪以来最有影响力的营销理念.如今,对于大多数企业,这已不成为问题--顾客的需求早已超越产品,成为营销者不懈的追求,但后者费劲周折取悦顾客的同时,却忽略了其他利益相关者,包括其他受营销活动影响或者可能会影响到营销活动的群体,主要包括员工、供应商、股东、社区及媒体、政府、消费者权益保护团体、竞争对手、某些非政府组织等等.

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新营销近视症

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市场营销（实务版） 2010年第6期

作者： N.Craig Smith INSEAD minette E.Drumwright Mary C.Gentile

当企业的营销团队在费尽周折取悦顾客时，却忽略了其他利益相关者。于是，新的营销近视症出现了

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